The installation can not complete due to this bug or error.
root@asterisk-pbx-server:/home/mike24/asterisk-20.8.1/freepbx# ./install -n
PHP Fatal error: Uncaught Error: Call to undefined function FreePBX\Install\simplexml_load_file() in /home/mike24/asterisk-20.8.1/freepbx/install:19
Stack trace:
#0 {main}
thrown in /home/mike24/asterisk-20.8.1/freepbx/install on line 19
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